What analysis utilizes the purge and trap technique?

The purge and trap technique is specifically designed for the analysis of volatile organic compounds (VOCs) in various matrices, such as water and soil. This method involves purging a sample with an inert gas, which helps to remove VOCs. The VOCs are then trapped in a suitable sorbent material. This allows for the concentration of these compounds before they are desorbed and analyzed, most commonly using gas chromatography.

Using this technique is especially effective because it enhances the sensitivity of detecting low levels of VOCs, which are often present in complex mixtures and can be critical for environmental monitoring and compliance with regulations. Hence, the correct answer emphasizes the application of purge and trap in examining volatile organic compounds, illustrating the importance of this analytical method in environmental chemistry and regulatory contexts.